In taking this route, you can be sure changes to your styles (cPanel Updates) will still work as expected. If you clone and customize your own as you have here, no updates to that theme will happen as I understand it.

Short of that, to set your current theme you've created to an account, modify the Package it uses. You'll see a drop down for the Package theme at bottom of edit list. When you edit that Package, all accounts using that Package should be updated to use the new theme.

One thing to think about is the bookmark users may have with (for example) /x3/ in it. When you switch theme they may need to update the bookmark. it's been a while since I switched out a theme so unclear on how that's handled now.

Hope that helps a bit.

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